import java.util.Scanner;
 public class Example2_3 {
  public static void main (String args[]){
   System.out.println("请输入若干数，每输入一个数回车确认");
   System.out.println("最后输入数字0结束输入操作");
   Scanner reader = new Scanner(System.in);
   double sum = 0;
   double x = reader.nextDouble();
   while(x!=0){
    sum=sum+x;
    x=reader.nextDouble();
   }
   System.out.println("sum="+sum);
 }
}
